~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/mips/generic/init.c

Version: ~ [ linux-5.10-rc1 ] ~ [ linux-5.9.1 ] ~ [ linux-5.8.16 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.72 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.152 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.202 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.240 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.240 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (C) 2016 Imagination Technologies
  3  * Author: Paul Burton <paul.burton@mips.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License as published by the
  7  * Free Software Foundation;  either version 2 of the  License, or (at your
  8  * option) any later version.
  9  */
 10 
 11 #include <linux/clk.h>
 12 #include <linux/clk-provider.h>
 13 #include <linux/clocksource.h>
 14 #include <linux/init.h>
 15 #include <linux/irqchip.h>
 16 #include <linux/of_fdt.h>
 17 
 18 #include <asm/bootinfo.h>
 19 #include <asm/fw/fw.h>
 20 #include <asm/irq_cpu.h>
 21 #include <asm/machine.h>
 22 #include <asm/mips-cps.h>
 23 #include <asm/prom.h>
 24 #include <asm/smp-ops.h>
 25 #include <asm/time.h>
 26 
 27 static __initdata const void *fdt;
 28 static __initdata const struct mips_machine *mach;
 29 static __initdata const void *mach_match_data;
 30 
 31 void __init prom_init(void)
 32 {
 33         plat_get_fdt();
 34         BUG_ON(!fdt);
 35 }
 36 
 37 void __init *plat_get_fdt(void)
 38 {
 39         const struct mips_machine *check_mach;
 40         const struct of_device_id *match;
 41 
 42         if (fdt)
 43                 /* Already set up */
 44                 return (void *)fdt;
 45 
 46         if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
 47                 /*
 48                  * We booted using the UHI boot protocol, so we have been
 49                  * provided with the appropriate device tree for the board.
 50                  * Make use of it & search for any machine struct based upon
 51                  * the root compatible string.
 52                  */
 53                 fdt = (void *)fw_arg1;
 54 
 55                 for_each_mips_machine(check_mach) {
 56                         match = mips_machine_is_compatible(check_mach, fdt);
 57                         if (match) {
 58                                 mach = check_mach;
 59                                 mach_match_data = match->data;
 60                                 break;
 61                         }
 62                 }
 63         } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
 64                 /*
 65                  * We weren't booted using the UHI boot protocol, but do
 66                  * support some number of boards with legacy boot protocols.
 67                  * Attempt to find the right one.
 68                  */
 69                 for_each_mips_machine(check_mach) {
 70                         if (!check_mach->detect)
 71                                 continue;
 72 
 73                         if (!check_mach->detect())
 74                                 continue;
 75 
 76                         mach = check_mach;
 77                 }
 78 
 79                 /*
 80                  * If we don't recognise the machine then we can't continue, so
 81                  * die here.
 82                  */
 83                 BUG_ON(!mach);
 84 
 85                 /* Retrieve the machine's FDT */
 86                 fdt = mach->fdt;
 87         }
 88         return (void *)fdt;
 89 }
 90 
 91 #ifdef CONFIG_RELOCATABLE
 92 
 93 void __init plat_fdt_relocated(void *new_location)
 94 {
 95         /*
 96          * reset fdt as the cached value would point to the location
 97          * before relocations happened and update the location argument
 98          * if it was passed using UHI
 99          */
100         fdt = NULL;
101 
102         if (fw_arg0 == -2)
103                 fw_arg1 = (unsigned long)new_location;
104 }
105 
106 #endif /* CONFIG_RELOCATABLE */
107 
108 void __init plat_mem_setup(void)
109 {
110         if (mach && mach->fixup_fdt)
111                 fdt = mach->fixup_fdt(fdt, mach_match_data);
112 
113         strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
114         __dt_setup_arch((void *)fdt);
115 }
116 
117 void __init device_tree_init(void)
118 {
119         int err;
120 
121         unflatten_and_copy_device_tree();
122         mips_cpc_probe();
123 
124         err = register_cps_smp_ops();
125         if (err)
126                 err = register_up_smp_ops();
127 }
128 
129 int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
130                                  const void *fdt_in,
131                                  const struct mips_fdt_fixup *fixups)
132 {
133         int err;
134 
135         err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
136         if (err) {
137                 pr_err("Failed to open FDT\n");
138                 return err;
139         }
140 
141         for (; fixups->apply; fixups++) {
142                 err = fixups->apply(fdt_out);
143                 if (err) {
144                         pr_err("Failed to apply FDT fixup \"%s\"\n",
145                                fixups->description);
146                         return err;
147                 }
148         }
149 
150         err = fdt_pack(fdt_out);
151         if (err)
152                 pr_err("Failed to pack FDT\n");
153         return err;
154 }
155 
156 void __init plat_time_init(void)
157 {
158         struct device_node *np;
159         struct clk *clk;
160 
161         of_clk_init(NULL);
162 
163         if (!cpu_has_counter) {
164                 mips_hpt_frequency = 0;
165         } else if (mach && mach->measure_hpt_freq) {
166                 mips_hpt_frequency = mach->measure_hpt_freq();
167         } else {
168                 np = of_get_cpu_node(0, NULL);
169                 if (!np) {
170                         pr_err("Failed to get CPU node\n");
171                         return;
172                 }
173 
174                 clk = of_clk_get(np, 0);
175                 if (IS_ERR(clk)) {
176                         pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
177                         return;
178                 }
179 
180                 mips_hpt_frequency = clk_get_rate(clk);
181                 clk_put(clk);
182 
183                 switch (boot_cpu_type()) {
184                 case CPU_20KC:
185                 case CPU_25KF:
186                         /* The counter runs at the CPU clock rate */
187                         break;
188                 default:
189                         /* The counter runs at half the CPU clock rate */
190                         mips_hpt_frequency /= 2;
191                         break;
192                 }
193         }
194 
195         timer_probe();
196 }
197 
198 void __init arch_init_irq(void)
199 {
200         struct device_node *intc_node;
201 
202         intc_node = of_find_compatible_node(NULL, NULL,
203                                             "mti,cpu-interrupt-controller");
204         if (!cpu_has_veic && !intc_node)
205                 mips_cpu_irq_init();
206         of_node_put(intc_node);
207 
208         irqchip_init();
209 }
210 
211 void __init prom_free_prom_memory(void)
212 {
213 }
214 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp